Familial Focal Epilepsy With Variable Foci

Familial Focal Epilepsy With Variable Foci (FFEVF): Disease Characteristics Research Report

Falcon MONDO:0020310 42 citations

Familial Focal Epilepsy With Variable Foci (FFEVF): Disease Characteristics Research Report

Executive summary

Familial focal epilepsy with variable foci (FFEVF; MIM 604364) is an autosomal dominant familial focal epilepsy in which affected relatives have focal seizures arising from different cortical regions (e.g., temporal, frontal, parietal, occipital), while each individual typically has a consistent focal onset pattern. It is most commonly caused by germline loss-of-function variants in genes encoding the GATOR1 complex (DEPDC5, NPRL2, NPRL3), a negative regulator of mTORC1 signaling, and it shows incomplete penetrance and highly variable expressivity. Key real-world implementations include broad epilepsy gene panel/WES testing, epilepsy-protocol MRI and long-term video-EEG, consideration of epilepsy surgery in drug-resistant cases (especially with focal cortical dysplasia), and increased attention to cardiorespiratory peri-ictal monitoring in some DEPDC5-related presentations. (kaur2013noveldepdc5mutations pages 1-4, dibbens2013mutationsindepdc5 pages 1-2, muller2024gator1mutationsimpair pages 1-2, baulac2015familialfocalepilepsy pages 1-4, meletti2024ictalandpostictal pages 1-3, mcginley2024seizurecontroloutcomes pages 1-2)

1. Disease information

1.1 Overview / definition

  • Definition (clinical): FFEVF is an autosomal dominant focal epilepsy syndrome notable because family members have seizures originating from different cortical regions. (dibbens2013mutationsindepdc5 pages 1-2)
  • Key defining feature: intrafamilial variability in seizure focus (temporal/frontal/frontotemporal/parietal/occipital) with often unremarkable structural MRI in many cases. (dibbens2013mutationsindepdc5 pages 1-2)

1.2 Key identifiers

  • OMIM/MIM:
  • FFEVF: MIM 604364 (explicitly cited). (kaur2013noveldepdc5mutations pages 1-4)
  • NPRL3-associated subtype: FFEVF3, OMIM 617118 (explicitly cited in NPRL3-focused report). (hu2023identificationoftwo pages 1-2)
  • MONDO / Orphanet / MeSH / ICD-10/ICD-11: Not available from the retrieved documents in this run; these should be filled from OMIM/Orphanet/MONDO/MeSH/ICD lookups outside the present evidence set.

1.3 Synonyms / alternative names

1.4 Evidence source type

The content summarized here is derived from aggregated disease-level resources within peer-reviewed primary literature (family studies, case series, surgical cohorts) and from recent reviews/analyses, rather than EHR-only sources. (dibbens2013mutationsindepdc5 pages 1-2, baulac2015familialfocalepilepsy pages 1-4, honke2023deephistopathologygenotype–phenotype pages 1-2)

Table (click to expand)
Item Details Key citations (pqac ids) URL Publication year
Disease name Familial focal epilepsy with variable foci (FFEVF) is an autosomal dominant familial focal epilepsy characterized by focal seizures arising from different cortical regions in different affected relatives. (dibbens2013mutationsindepdc5 pages 1-2, kaur2013noveldepdc5mutations pages 1-4, wang2023theclinicalfeatures pages 1-2) https://doi.org/10.1038/ng.2599 2013
Synonyms Familial focal epilepsy with variable foci; focal epilepsy with variable foci; FFEVF; FFEVF3 (for NPRL3-related subtype); earlier literature also refers to the same syndrome as FPEVF/partial epilepsy with variable foci. (dibbens2013mutationsindepdc5 pages 1-2, hu2023identificationoftwo pages 1-2, wang2023theclinicalfeatures pages 1-2) https://doi.org/10.3389/fgene.2022.1054567 2023
OMIM / MIM phenotype numbers MIM 604364 is explicitly cited for FFEVF; OMIM 617118 is explicitly cited for FFEVF3 / NPRL3-associated disease. (kaur2013noveldepdc5mutations pages 1-4, hu2023identificationoftwo pages 1-2) https://doi.org/10.1111/cge.12239 2013
Inheritance Autosomal dominant inheritance with incomplete penetrance and variable expressivity are recurrently reported across DEPDC5-, NPRL2-, and NPRL3-related families. (kaur2013noveldepdc5mutations pages 1-4, yang2024phenotypicandgenotypic pages 1-2, wang2023theclinicalfeatures pages 1-2) https://doi.org/10.1371/journal.pone.0284924 2023
Key gene DEPDC5; identified as a common cause of familial focal epilepsies/FFEVF, including large linked families; many variants are truncating and support haploinsufficiency. (dibbens2013mutationsindepdc5 pages 1-2, baulac2014geneticsadvancesin pages 6-9, zhang2021phenotypicandgenotypic pages 1-2) https://doi.org/10.1038/ng.2599 2013
Key gene NPRL2; GATOR1 component implicated in FFEVF, including splice-site variants causing aberrant splicing and exon skipping. (zhang2022asplicingvariation pages 1-2, muller2024gator1mutationsimpair pages 1-2) https://doi.org/10.1038/s10038-021-00969-z 2022
Key gene NPRL3; GATOR1 component implicated in FFEVF3, with nonsense, frameshift, splice, deletion, and other loss-of-function variants reported. (hu2023identificationoftwo pages 1-2, yang2024phenotypicandgenotypic pages 1-2, nouri2024fromalphathalassemiatrait pages 1-2) https://doi.org/10.3389/fgene.2022.1054567 2023
Brief mechanistic note DEPDC5, NPRL2, and NPRL3 form the GATOR1 complex, a negative regulator of the amino-acid sensing branch of mTORC1 signaling; pathogenic variants generally reduce GATOR1 function, leading to mTORC1 hyperactivation. (muller2024gator1mutationsimpair pages 1-2, hu2023identificationoftwo pages 1-2, wang2023theclinicalfeatures pages 1-2) https://doi.org/10.3390/ijms25042068 2024

Table: This table summarizes the core disease identity, identifiers, inheritance, major genes, and shared GATOR1–mTORC1 mechanism for familial focal epilepsy with variable foci. It is useful as a compact reference for knowledge-base curation grounded only in the cited evidence.

2. Etiology

2.1 Primary causal factors

Genetic (major): Heterozygous pathogenic variants in DEPDC5, and also NPRL2/NPRL3, are repeatedly implicated in FFEVF and related focal epilepsy spectra. (dibbens2013mutationsindepdc5 pages 1-2, zhang2022asplicingvariation pages 1-2, hu2023identificationoftwo pages 1-2)

Illustrative primary-literature statement (DEPDC5 discovery): Dibbens et al. report that exome sequencing identified DEPDC5 mutations in linked FFEVF families and that “Study of families with focal epilepsy that were too small for conventional clinical diagnosis with FFEVF identified DEPDC5 mutations in approximately 12% of families (10/82).” (Nature Genetics; published online 31 Mar 2013; https://doi.org/10.1038/ng.2599) (dibbens2013mutationsindepdc5 pages 1-2)

2.2 Risk factors

Environmental risk factors: Not specifically established for this Mendelian syndrome in the retrieved evidence set.

2.3 Protective factors

No validated protective genetic or environmental factors specific to FFEVF were found in the retrieved corpus.

2.4 Gene–environment interactions

No direct gene–environment interaction studies specific to FFEVF were found in the retrieved corpus.

3. Phenotypes (clinical spectrum)

3.1 Core seizure phenotypes

3.2 EEG, imaging, and lesion-associated phenotypes

  • MRI often unremarkable in non-lesional familial presentations (structural MRI “usually unremarkable” in the large family description). (dibbens2013mutationsindepdc5 pages 1-2)
  • Focal cortical dysplasia (FCD) association (DEPDC5): Seven patients from four families with truncating DEPDC5 variants had focal epilepsy associated with FCD (types included FCD IIa and FCD I); MRI could be negative/atypical, and favorable surgical outcomes occurred in several patients. (Annals of Neurology; Apr 2015; https://doi.org/10.1002/ana.24368) (baulac2015familialfocalepilepsy pages 1-4)
  • Genotype–histopathology correlation (brain-tissue genetics, 2023): In a 17-individual surgical cohort, GATOR1 loss-of-function variants (DEPDC5 n=7; NPRL3 n=3) were associated with FCDIIa and often subtle/negative MRI (seven individuals), and 50% showed a vacuolizing phenotype with p62 aggregates in autophagosomes. (Acta Neuropathologica Communications; Nov 2023; https://doi.org/10.1186/s40478-023-01675-x) (honke2023deephistopathologygenotype–phenotype pages 1-2)

3.3 Comorbidities / neurodevelopment

  • Most affected individuals in the initial Nature Genetics description “typically have normal intellect,” but some relatives can have “intellectual disability, psychiatric disorders … or autism spectrum disorders.” (dibbens2013mutationsindepdc5 pages 1-2)

3.4 Cardiorespiratory and SUDEP-relevant phenotypes (recent development)

A 2024 Neurology Genetics cohort study evaluated ictal central apnea (ICA) in focal epilepsy patients undergoing long-term video-EEG with cardiorespiratory polygraphy and found DEPDC5 variants enriched among those with ICA: 5/14 (35%) of ICA patients had pathogenic DEPDC5 variants vs 0/15 without ICA. In DEPDC5 patients, ICA occurred in all recorded seizures (n=15) with apnea durations 20 seconds to >1 minute, with temporal EEG involvement in all events and severe oxygen desaturation in 2 cases. (Neurology Genetics; Oct 2024; https://doi.org/10.1212/nxg.0000000000200183) (meletti2024ictalandpostictal pages 1-3)

Visual evidence from this paper (pedigrees/variant schematic/clinical table) is available in extracted figure/table crops. (meletti2024ictalandpostictal media 949a04e5, meletti2024ictalandpostictal media 1e3201ae)

3.5 Suggested HPO terms (examples)

(ontology suggestions; not exhaustive) - Focal seizures: HP:0007359 - Focal to bilateral tonic-clonic seizures: HP:0007334 - Febrile seizures: HP:0002373 - Infantile spasms: HP:0012469 - Abnormal EEG: HP:0002353 - Epileptiform discharges: HP:0002350 - Focal cortical dysplasia: HP:0010636 - Hemimegalencephaly: HP:0007315 (noted as part of NPRL3 phenotypic expansion in broader literature; not directly extracted in this run) - Developmental delay: HP:0001263 - Autism: HP:0000717

4. Genetic / molecular information

4.1 Causal genes

Causal genes in this disorder cluster in the GATOR1 complex: - DEPDC5 (most commonly reported in familial focal epilepsies/FFEVF). (dibbens2013mutationsindepdc5 pages 1-2, baulac2014geneticsadvancesin pages 6-9) - NPRL2 (splicing variants reported; functional splicing assays used). (zhang2022asplicingvariation pages 1-2) - NPRL3 (nonsense, frameshift, splice, deletion). (hu2023identificationoftwo pages 1-2, nouri2024fromalphathalassemiatrait pages 1-2)

4.2 Variant classes and functional consequences

4.3 Penetrance and expressivity

4.4 Genotype–phenotype correlations (selected)

  • DEPDC5 variants can present as non-lesional familial focal epilepsy or as focal epilepsy with FCD; in DEPDC5-associated FCD, brain somatic second hits have been detected, consistent with a two-hit lesion model. (baulac2015familialfocalepilepsy pages 1-4)
  • Brain-tissue sequencing in FCDII suggests GATOR1 variants correlate with FCDIIa subtype and an autophagy-altered phenotype (p62 aggregates), contrasting with MTOR-associated lesions. (honke2023deephistopathologygenotype–phenotype pages 1-2)

5. Environmental information

No consistent non-genetic environmental contributors specific to FFEVF were identified in the retrieved evidence.

6. Mechanism / pathophysiology

6.1 Current mechanistic model (GATOR1–mTORC1)

GATOR1 (DEPDC5–NPRL2–NPRL3) is a GTPase-activating protein complex regulating mTORC1 in response to amino acids and other upstream signals; epilepsy-associated mutations in GATOR1 subunits are linked to dysregulated mTORC1 activity. (muller2024gator1mutationsimpair pages 1-2, hu2023identificationoftwo pages 1-2)

Direct abstract quote (cell biology; Feb 2024): “GATOR1 … controls the activity of mTORC1 … in response to amino acid availability… epilepsy-linked mutations in the NPRL2 subunit … increase basal mTORC1 signal transduction…” and “NPRL2-L105P is a loss-of-function mutation that disrupts protein interactions with NPRL3 and DEPDC5, impairing GATOR1 complex assembly and resulting in high mTORC1 activity…” (Int J Mol Sci; published 8 Feb 2024; https://doi.org/10.3390/ijms25042068) (muller2024gator1mutationsimpair pages 1-2)

6.2 From molecular defect to seizures (causal chain; synthesis)

1) Germline loss-of-function variant in DEPDC5/NPRL2/NPRL3 → 2) impaired GATOR1 inhibition → 3) relative mTORC1 hyperactivation → 4) altered neurodevelopmental processes and/or cortical network excitability; in some patients, second-hit/somatic events in brain tissue contribute to focal malformations such as FCD → 5) focal seizure generation with variable anatomic foci within families. Evidence for steps 1–3 is supported by GATOR1 mechanistic studies and genetic association; steps 4–5 are supported by surgical pathology/genetic “two-hit” observations. (muller2024gator1mutationsimpair pages 1-2, baulac2015familialfocalepilepsy pages 1-4, honke2023deephistopathologygenotype–phenotype pages 1-2)

6.3 Cellular/tissue processes implicated

  • mTOR pathway activation markers in dysmorphic neurons: pS6 immunoreactivity is noted as indicating constitutive mTOR pathway activation in FCDII. (honke2023deephistopathologygenotype–phenotype pages 1-2)
  • Autophagy-related phenotype in GATOR1-positive FCDIIa: 50% vacuolizing phenotype with p62 aggregates in autophagosomes. (honke2023deephistopathologygenotype–phenotype pages 1-2)

6.4 Suggested GO / CL terms (examples)

(ontology suggestions) - GO biological process: “mTOR signaling” (e.g., GO:0048015), “autophagy” (e.g., GO:0006914), “regulation of synaptic transmission” (broad) - CL terms: “cortical pyramidal neuron” (broad), “GABAergic interneuron” (broad; mechanistic neurophysiology studies suggest hyperexcitability without direct GABA inhibition changes in some carriers—see below)

6.5 Neurophysiology (recent development)

A 2023 multimodal study in DEPDC5/NPRL3 mutation carriers reported no effect on cortical GABAergic receptor-mediated inhibition or GABA concentration by TMS/MRS, but stronger EEG theta and stronger/more synchronous gamma oscillations, interpreted as increased neural entrainment consistent with cortical hyperexcitability mediated by increased mTORC1 signaling. (Orphanet Journal of Rare Diseases; Jan 2023; https://doi.org/10.1186/s13023-022-02600-6) (meletti2024ictalandpostictal pages 1-3)

7. Anatomical structures affected

7.1 Organ/system

7.2 Brain regions (variable by individual/family)

  • Temporal, frontal, frontotemporal, parietal, occipital cortical regions. (dibbens2013mutationsindepdc5 pages 1-2)
  • In surgical FCD cohorts with GATOR1 variants, lesions often involve the frontal lobe and may be confined to cortical ribbon. (honke2023deephistopathologygenotype–phenotype pages 1-2)

7.3 Suggested UBERON terms (examples)

(ontology suggestions) - Cerebral cortex: UBERON:0000956 - Frontal lobe: UBERON:0001870 - Temporal lobe: UBERON:0001874 - Hippocampus: UBERON:0001954 (e.g., hippocampal sclerosis noted in a 2024 NPRL3 deletion case). (nouri2024fromalphathalassemiatrait pages 1-2)

8. Temporal development

9. Inheritance and population

9.1 Inheritance

9.2 Epidemiology

FFEVF-specific incidence/prevalence estimates were not found in the retrieved corpus.

For context (epilepsy overall): - A large 2024 exome-sequencing study introduction states epilepsy prevalence is 4–10 per 1,000 individuals worldwide. (Nat Neurosci; Oct 2024; https://doi.org/10.1038/s41593-024-01747-8) (anders2024exomesequencingof pages 1-2) - SUDEP background incidence is cited as 0.22 to 1.2 per 1,000 individuals per year and may account for up to 17% of deaths among people with epilepsy (general estimate; not specific to FFEVF). (Neurology Genetics; Oct 2024; https://doi.org/10.1212/nxg.0000000000200183) (meletti2024ictalandpostictal pages 1-3)

9.3 Demographics / founder effects

No population-specific founder effects for FFEVF variants were extractable from the retrieved text (some shared ancestry is discussed in the 2013 DEPDC5 paper but not fully extracted here). (dibbens2013mutationsindepdc5 pages 1-2)

10. Diagnostics

10.1 Clinical tests and findings

  • EEG: abnormal EEG findings are common but variable; examples include epileptiform discharges and slow waves (NPRL3 family report). (wang2023theclinicalfeatures pages 1-2)
  • MRI: may be normal in many; in lesion-associated cases, epilepsy-protocol MRI and advanced review/post-processing can identify subtle FCD or hippocampal sclerosis (NPRL3 deletion case review). (nouri2024fromalphathalassemiatrait pages 1-2)
  • Long-term video-EEG with cardiorespiratory polygraphy: recommended/clinically motivated in DEPDC5-related focal epilepsy when ictal apnea is suspected. (meletti2024ictalandpostictal pages 1-3)

10.2 Genetic testing

10.3 Differential diagnosis

Differential diagnoses include other genetic focal epilepsies and malformations of cortical development (e.g., MTOR-pathway focal cortical dysplasia not driven by GATOR1). (honke2023deephistopathologygenotype–phenotype pages 1-2)

11. Outcomes / prognosis

11.1 Drug resistance

11.2 Surgical outcomes (real-world implementation)

12. Treatment

12.1 Pharmacotherapy (ASMs)

No FFEVF gene-specific randomized controlled trials were found in the retrieved corpus; management follows standard focal epilepsy approaches.

MAXO suggestions (examples): - Anti-seizure medication therapy: MAXO:0000744 (anticonvulsant therapy; approximate) - Vitamin B6 supplementation: (MAXO term for pyridoxine supplementation)

12.2 Surgical and interventional

MAXO suggestions: epilepsy surgery / focal resection.

12.3 Monitoring and SUDEP-risk mitigation

Given evidence that ictal central apnea may be common in some DEPDC5-related seizures and that the cohort authors support respiratory polygraphy during LTVM, implementation includes cardiorespiratory monitoring during presurgical evaluation and consideration of genetic testing in focal epilepsy with unexplained ictal apnea. (meletti2024ictalandpostictal pages 1-3)

13. Prevention

No primary prevention strategies specific to FFEVF are established in the retrieved evidence.

Secondary/tertiary prevention in practice includes: - Cascade genetic testing and counseling in families once a pathogenic GATOR1 variant is identified (implied by autosomal dominant inheritance and use of family testing in reports). (hu2023identificationoftwo pages 1-2, dibbens2013mutationsindepdc5 pages 1-2) - Early identification of drug resistance and timely referral for surgical evaluation in appropriate candidates. (baulac2015familialfocalepilepsy pages 1-4, mcginley2024seizurecontroloutcomes pages 1-2)

14. Other species / natural disease

No naturally occurring non-human disease analogs were identified in the retrieved evidence set.

15. Model organisms

No organismal model studies were directly extracted in this run; however, mechanistic cellular studies of GATOR1 complex function and mTORC1 regulation provide functional context for epilepsy-associated variants. (muller2024gator1mutationsimpair pages 1-2)

Recent developments (prioritizing 2023–2024)

1) Brain-tissue genotype–histopathology: GATOR1 variants correlate with FCDIIa and autophagy-altered pathology (p62 aggregates) and subtle MRI findings in many cases, supporting integrated molecular neuropathology workflows. (Honke et al., Nov 2023; https://doi.org/10.1186/s40478-023-01675-x) (honke2023deephistopathologygenotype–phenotype pages 1-2) 2) Cardiorespiratory phenotyping: ICA enrichment among DEPDC5 pathogenic variant carriers during LTVM suggests new clinical attention to respiratory monitoring and genetic testing in ICA presentations. (Meletti et al., Oct 2024; https://doi.org/10.1212/nxg.0000000000200183) (meletti2024ictalandpostictal pages 1-3, meletti2024ictalandpostictal media 949a04e5) 3) Surgery outcomes synthesis: Systematic review indicates high postoperative improvement and substantial Engel class I rates among DEPDC5-variant patients with cortical dysplasia undergoing resection. (McGinley et al., 2024; https://doi.org/10.1055/a-2213-8584) (mcginley2024seizurecontroloutcomes pages 1-2) 4) Mechanistic refinement: Cell-signaling work shows epilepsy-linked NPRL2 mutations can disrupt GATOR1 assembly and impair mTORC1 regulation by amino acids and PI3K-dependent growth factor signaling. (Muller et al., Feb 2024; https://doi.org/10.3390/ijms25042068) (muller2024gator1mutationsimpair pages 1-2) 5) Genomic diagnostic odysseys / syndromic overlap: A 2024 report highlights that deletions encompassing NPRL3 can co-present with α-thalassemia trait due to regulatory-region overlap, and that delayed diagnosis can occur without early comprehensive genetic assessment. (Nouri et al., Jun 2024; https://doi.org/10.3390/genes15070836) (nouri2024fromalphathalassemiatrait pages 1-2)

Current applications and real-world implementations

Clinical trials (latest; real-world precision-medicine implementation)

NCT05450822 — “Precision Medicine in the Treatment of Epilepsy” (BrainDrugs-Epilepsy Study; Denmark) - Study type/status: observational, recruiting; first posted 2022-07-11, last update posted 2024-04-11. (NCT05450822 chunk 1) - Design: prospective cohort with multimodal biomarkers (EEG/MRI; subset PET) and ASM initiation with lamotrigine or levetiracetam; genetic biomarkers list includes DEPDC5, NPRL2, NPRL3 (among many). (NCT05450822 chunk 1) - URL: https://clinicaltrials.gov/study/NCT05450822 (derived from NCT ID; trial record text in context) (NCT05450822 chunk 1)

Limitations of this report (evidence availability)

Cited figure/table evidence available

  • Meletti et al. 2024 extracted: flowchart/pedigrees/variant schematic and clinical features table. (meletti2024ictalandpostictal media 949a04e5, meletti2024ictalandpostictal media 1e3201ae)

References

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